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1/*
2 * GPMC support functions
3 *
4 * Copyright (C) 2005-2006 Nokia Corporation
5 *
6 * Author: Juha Yrjola
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15#undef DEBUG
16
17#include <linux/irq.h>
18#include <linux/kernel.h>
19#include <linux/init.h>
20#include <linux/err.h>
21#include <linux/clk.h>
22#include <linux/ioport.h>
23#include <linux/spinlock.h>
24#include <linux/io.h>
25#include <linux/module.h>
26#include <linux/interrupt.h>
27
28#include <asm/mach-types.h>
29#include <plat/gpmc.h>
30
31#include <plat/sdrc.h>
32
33/* GPMC register offsets */
34#define GPMC_REVISION 0x00
35#define GPMC_SYSCONFIG 0x10
36#define GPMC_SYSSTATUS 0x14
37#define GPMC_IRQSTATUS 0x18
38#define GPMC_IRQENABLE 0x1c
39#define GPMC_TIMEOUT_CONTROL 0x40
40#define GPMC_ERR_ADDRESS 0x44
41#define GPMC_ERR_TYPE 0x48
42#define GPMC_CONFIG 0x50
43#define GPMC_STATUS 0x54
44#define GPMC_PREFETCH_CONFIG1 0x1e0
45#define GPMC_PREFETCH_CONFIG2 0x1e4
46#define GPMC_PREFETCH_CONTROL 0x1ec
47#define GPMC_PREFETCH_STATUS 0x1f0
48#define GPMC_ECC_CONFIG 0x1f4
49#define GPMC_ECC_CONTROL 0x1f8
50#define GPMC_ECC_SIZE_CONFIG 0x1fc
51#define GPMC_ECC1_RESULT 0x200
52
53#define GPMC_CS0_OFFSET 0x60
54#define GPMC_CS_SIZE 0x30
55
56#define GPMC_MEM_START 0x00000000
57#define GPMC_MEM_END 0x3FFFFFFF
58#define BOOT_ROM_SPACE 0x100000 /* 1MB */
59
60#define GPMC_CHUNK_SHIFT 24 /* 16 MB */
61#define GPMC_SECTION_SHIFT 28 /* 128 MB */
62
63#define CS_NUM_SHIFT 24
64#define ENABLE_PREFETCH (0x1 << 7)
65#define DMA_MPU_MODE 2
66
67/* Structure to save gpmc cs context */
68struct gpmc_cs_config {
69 u32 config1;
70 u32 config2;
71 u32 config3;
72 u32 config4;
73 u32 config5;
74 u32 config6;
75 u32 config7;
76 int is_valid;
77};
78
79/*
80 * Structure to save/restore gpmc context
81 * to support core off on OMAP3
82 */
83struct omap3_gpmc_regs {
84 u32 sysconfig;
85 u32 irqenable;
86 u32 timeout_ctrl;
87 u32 config;
88 u32 prefetch_config1;
89 u32 prefetch_config2;
90 u32 prefetch_control;
91 struct gpmc_cs_config cs_context[GPMC_CS_NUM];
92};
93
94static struct resource gpmc_mem_root;
95static struct resource gpmc_cs_mem[GPMC_CS_NUM];
96static DEFINE_SPINLOCK(gpmc_mem_lock);
97static unsigned int gpmc_cs_map; /* flag for cs which are initialized */
98static int gpmc_ecc_used = -EINVAL; /* cs using ecc engine */
99
100static void __iomem *gpmc_base;
101
102static struct clk *gpmc_l3_clk;
103
104static irqreturn_t gpmc_handle_irq(int irq, void *dev);
105
106static void gpmc_write_reg(int idx, u32 val)
107{
108 __raw_writel(val, gpmc_base + idx);
109}
110
111static u32 gpmc_read_reg(int idx)
112{
113 return __raw_readl(gpmc_base + idx);
114}
115
116static void gpmc_cs_write_byte(int cs, int idx, u8 val)
117{
118 void __iomem *reg_addr;
119
120 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
121 __raw_writeb(val, reg_addr);
122}
123
124static u8 gpmc_cs_read_byte(int cs, int idx)
125{
126 void __iomem *reg_addr;
127
128 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
129 return __raw_readb(reg_addr);
130}
131
132void gpmc_cs_write_reg(int cs, int idx, u32 val)
133{
134 void __iomem *reg_addr;
135
136 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
137 __raw_writel(val, reg_addr);
138}
139
140u32 gpmc_cs_read_reg(int cs, int idx)
141{
142 void __iomem *reg_addr;
143
144 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
145 return __raw_readl(reg_addr);
146}
147
148/* TODO: Add support for gpmc_fck to clock framework and use it */
149unsigned long gpmc_get_fclk_period(void)
150{
151 unsigned long rate = clk_get_rate(gpmc_l3_clk);
152
153 if (rate == 0) {
154 printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
155 return 0;
156 }
157
158 rate /= 1000;
159 rate = 1000000000 / rate; /* In picoseconds */
160
161 return rate;
162}
163
164unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
165{
166 unsigned long tick_ps;
167
168 /* Calculate in picosecs to yield more exact results */
169 tick_ps = gpmc_get_fclk_period();
170
171 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
172}
173
174unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
175{
176 unsigned long tick_ps;
177
178 /* Calculate in picosecs to yield more exact results */
179 tick_ps = gpmc_get_fclk_period();
180
181 return (time_ps + tick_ps - 1) / tick_ps;
182}
183
184unsigned int gpmc_ticks_to_ns(unsigned int ticks)
185{
186 return ticks * gpmc_get_fclk_period() / 1000;
187}
188
189unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
190{
191 unsigned long ticks = gpmc_ns_to_ticks(time_ns);
192
193 return ticks * gpmc_get_fclk_period() / 1000;
194}
195
196#ifdef DEBUG
197static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
198 int time, const char *name)
199#else
200static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
201 int time)
202#endif
203{
204 u32 l;
205 int ticks, mask, nr_bits;
206
207 if (time == 0)
208 ticks = 0;
209 else
210 ticks = gpmc_ns_to_ticks(time);
211 nr_bits = end_bit - st_bit + 1;
212 if (ticks >= 1 << nr_bits) {
213#ifdef DEBUG
214 printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
215 cs, name, time, ticks, 1 << nr_bits);
216#endif
217 return -1;
218 }
219
220 mask = (1 << nr_bits) - 1;
221 l = gpmc_cs_read_reg(cs, reg);
222#ifdef DEBUG
223 printk(KERN_INFO
224 "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
225 cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
226 (l >> st_bit) & mask, time);
227#endif
228 l &= ~(mask << st_bit);
229 l |= ticks << st_bit;
230 gpmc_cs_write_reg(cs, reg, l);
231
232 return 0;
233}
234
235#ifdef DEBUG
236#define GPMC_SET_ONE(reg, st, end, field) \
237 if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
238 t->field, #field) < 0) \
239 return -1
240#else
241#define GPMC_SET_ONE(reg, st, end, field) \
242 if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
243 return -1
244#endif
245
246int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
247{
248 int div;
249 u32 l;
250
251 l = sync_clk + (gpmc_get_fclk_period() - 1);
252 div = l / gpmc_get_fclk_period();
253 if (div > 4)
254 return -1;
255 if (div <= 0)
256 div = 1;
257
258 return div;
259}
260
261int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
262{
263 int div;
264 u32 l;
265
266 div = gpmc_cs_calc_divider(cs, t->sync_clk);
267 if (div < 0)
268 return -1;
269
270 GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
271 GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
272 GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
273
274 GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
275 GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
276 GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
277
278 GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
279 GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
280 GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
281 GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
282
283 GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
284 GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
285 GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
286
287 GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
288
289 if (cpu_is_omap34xx()) {
290 GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
291 GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
292 }
293
294 /* caller is expected to have initialized CONFIG1 to cover
295 * at least sync vs async
296 */
297 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
298 if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
299#ifdef DEBUG
300 printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
301 cs, (div * gpmc_get_fclk_period()) / 1000, div);
302#endif
303 l &= ~0x03;
304 l |= (div - 1);
305 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
306 }
307
308 return 0;
309}
310
311static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
312{
313 u32 l;
314 u32 mask;
315
316 mask = (1 << GPMC_SECTION_SHIFT) - size;
317 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
318 l &= ~0x3f;
319 l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
320 l &= ~(0x0f << 8);
321 l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
322 l |= GPMC_CONFIG7_CSVALID;
323 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
324}
325
326static void gpmc_cs_disable_mem(int cs)
327{
328 u32 l;
329
330 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
331 l &= ~GPMC_CONFIG7_CSVALID;
332 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
333}
334
335static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
336{
337 u32 l;
338 u32 mask;
339
340 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
341 *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
342 mask = (l >> 8) & 0x0f;
343 *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
344}
345
346static int gpmc_cs_mem_enabled(int cs)
347{
348 u32 l;
349
350 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
351 return l & GPMC_CONFIG7_CSVALID;
352}
353
354int gpmc_cs_set_reserved(int cs, int reserved)
355{
356 if (cs > GPMC_CS_NUM)
357 return -ENODEV;
358
359 gpmc_cs_map &= ~(1 << cs);
360 gpmc_cs_map |= (reserved ? 1 : 0) << cs;
361
362 return 0;
363}
364
365int gpmc_cs_reserved(int cs)
366{
367 if (cs > GPMC_CS_NUM)
368 return -ENODEV;
369
370 return gpmc_cs_map & (1 << cs);
371}
372
373static unsigned long gpmc_mem_align(unsigned long size)
374{
375 int order;
376
377 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
378 order = GPMC_CHUNK_SHIFT - 1;
379 do {
380 size >>= 1;
381 order++;
382 } while (size);
383 size = 1 << order;
384 return size;
385}
386
387static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
388{
389 struct resource *res = &gpmc_cs_mem[cs];
390 int r;
391
392 size = gpmc_mem_align(size);
393 spin_lock(&gpmc_mem_lock);
394 res->start = base;
395 res->end = base + size - 1;
396 r = request_resource(&gpmc_mem_root, res);
397 spin_unlock(&gpmc_mem_lock);
398
399 return r;
400}
401
402int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
403{
404 struct resource *res = &gpmc_cs_mem[cs];
405 int r = -1;
406
407 if (cs > GPMC_CS_NUM)
408 return -ENODEV;
409
410 size = gpmc_mem_align(size);
411 if (size > (1 << GPMC_SECTION_SHIFT))
412 return -ENOMEM;
413
414 spin_lock(&gpmc_mem_lock);
415 if (gpmc_cs_reserved(cs)) {
416 r = -EBUSY;
417 goto out;
418 }
419 if (gpmc_cs_mem_enabled(cs))
420 r = adjust_resource(res, res->start & ~(size - 1), size);
421 if (r < 0)
422 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
423 size, NULL, NULL);
424 if (r < 0)
425 goto out;
426
427 gpmc_cs_enable_mem(cs, res->start, resource_size(res));
428 *base = res->start;
429 gpmc_cs_set_reserved(cs, 1);
430out:
431 spin_unlock(&gpmc_mem_lock);
432 return r;
433}
434EXPORT_SYMBOL(gpmc_cs_request);
435
436void gpmc_cs_free(int cs)
437{
438 spin_lock(&gpmc_mem_lock);
439 if (cs >= GPMC_CS_NUM || cs < 0 || !gpmc_cs_reserved(cs)) {
440 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
441 BUG();
442 spin_unlock(&gpmc_mem_lock);
443 return;
444 }
445 gpmc_cs_disable_mem(cs);
446 release_resource(&gpmc_cs_mem[cs]);
447 gpmc_cs_set_reserved(cs, 0);
448 spin_unlock(&gpmc_mem_lock);
449}
450EXPORT_SYMBOL(gpmc_cs_free);
451
452/**
453 * gpmc_read_status - read access request to get the different gpmc status
454 * @cmd: command type
455 * @return status
456 */
457int gpmc_read_status(int cmd)
458{
459 int status = -EINVAL;
460 u32 regval = 0;
461
462 switch (cmd) {
463 case GPMC_GET_IRQ_STATUS:
464 status = gpmc_read_reg(GPMC_IRQSTATUS);
465 break;
466
467 case GPMC_PREFETCH_FIFO_CNT:
468 regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
469 status = GPMC_PREFETCH_STATUS_FIFO_CNT(regval);
470 break;
471
472 case GPMC_PREFETCH_COUNT:
473 regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
474 status = GPMC_PREFETCH_STATUS_COUNT(regval);
475 break;
476
477 case GPMC_STATUS_BUFFER:
478 regval = gpmc_read_reg(GPMC_STATUS);
479 /* 1 : buffer is available to write */
480 status = regval & GPMC_STATUS_BUFF_EMPTY;
481 break;
482
483 default:
484 printk(KERN_ERR "gpmc_read_status: Not supported\n");
485 }
486 return status;
487}
488EXPORT_SYMBOL(gpmc_read_status);
489
490/**
491 * gpmc_cs_configure - write request to configure gpmc
492 * @cs: chip select number
493 * @cmd: command type
494 * @wval: value to write
495 * @return status of the operation
496 */
497int gpmc_cs_configure(int cs, int cmd, int wval)
498{
499 int err = 0;
500 u32 regval = 0;
501
502 switch (cmd) {
503 case GPMC_ENABLE_IRQ:
504 gpmc_write_reg(GPMC_IRQENABLE, wval);
505 break;
506
507 case GPMC_SET_IRQ_STATUS:
508 gpmc_write_reg(GPMC_IRQSTATUS, wval);
509 break;
510
511 case GPMC_CONFIG_WP:
512 regval = gpmc_read_reg(GPMC_CONFIG);
513 if (wval)
514 regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
515 else
516 regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
517 gpmc_write_reg(GPMC_CONFIG, regval);
518 break;
519
520 case GPMC_CONFIG_RDY_BSY:
521 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
522 if (wval)
523 regval |= WR_RD_PIN_MONITORING;
524 else
525 regval &= ~WR_RD_PIN_MONITORING;
526 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
527 break;
528
529 case GPMC_CONFIG_DEV_SIZE:
530 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
531 regval |= GPMC_CONFIG1_DEVICESIZE(wval);
532 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
533 break;
534
535 case GPMC_CONFIG_DEV_TYPE:
536 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
537 regval |= GPMC_CONFIG1_DEVICETYPE(wval);
538 if (wval == GPMC_DEVICETYPE_NOR)
539 regval |= GPMC_CONFIG1_MUXADDDATA;
540 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
541 break;
542
543 default:
544 printk(KERN_ERR "gpmc_configure_cs: Not supported\n");
545 err = -EINVAL;
546 }
547
548 return err;
549}
550EXPORT_SYMBOL(gpmc_cs_configure);
551
552/**
553 * gpmc_nand_read - nand specific read access request
554 * @cs: chip select number
555 * @cmd: command type
556 */
557int gpmc_nand_read(int cs, int cmd)
558{
559 int rval = -EINVAL;
560
561 switch (cmd) {
562 case GPMC_NAND_DATA:
563 rval = gpmc_cs_read_byte(cs, GPMC_CS_NAND_DATA);
564 break;
565
566 default:
567 printk(KERN_ERR "gpmc_read_nand_ctrl: Not supported\n");
568 }
569 return rval;
570}
571EXPORT_SYMBOL(gpmc_nand_read);
572
573/**
574 * gpmc_nand_write - nand specific write request
575 * @cs: chip select number
576 * @cmd: command type
577 * @wval: value to write
578 */
579int gpmc_nand_write(int cs, int cmd, int wval)
580{
581 int err = 0;
582
583 switch (cmd) {
584 case GPMC_NAND_COMMAND:
585 gpmc_cs_write_byte(cs, GPMC_CS_NAND_COMMAND, wval);
586 break;
587
588 case GPMC_NAND_ADDRESS:
589 gpmc_cs_write_byte(cs, GPMC_CS_NAND_ADDRESS, wval);
590 break;
591
592 case GPMC_NAND_DATA:
593 gpmc_cs_write_byte(cs, GPMC_CS_NAND_DATA, wval);
594
595 default:
596 printk(KERN_ERR "gpmc_write_nand_ctrl: Not supported\n");
597 err = -EINVAL;
598 }
599 return err;
600}
601EXPORT_SYMBOL(gpmc_nand_write);
602
603
604
605/**
606 * gpmc_prefetch_enable - configures and starts prefetch transfer
607 * @cs: cs (chip select) number
608 * @fifo_th: fifo threshold to be used for read/ write
609 * @dma_mode: dma mode enable (1) or disable (0)
610 * @u32_count: number of bytes to be transferred
611 * @is_write: prefetch read(0) or write post(1) mode
612 */
613int gpmc_prefetch_enable(int cs, int fifo_th, int dma_mode,
614 unsigned int u32_count, int is_write)
615{
616
617 if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) {
618 pr_err("gpmc: fifo threshold is not supported\n");
619 return -1;
620 } else if (!(gpmc_read_reg(GPMC_PREFETCH_CONTROL))) {
621 /* Set the amount of bytes to be prefetched */
622 gpmc_write_reg(GPMC_PREFETCH_CONFIG2, u32_count);
623
624 /* Set dma/mpu mode, the prefetch read / post write and
625 * enable the engine. Set which cs is has requested for.
626 */
627 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, ((cs << CS_NUM_SHIFT) |
628 PREFETCH_FIFOTHRESHOLD(fifo_th) |
629 ENABLE_PREFETCH |
630 (dma_mode << DMA_MPU_MODE) |
631 (0x1 & is_write)));
632
633 /* Start the prefetch engine */
634 gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x1);
635 } else {
636 return -EBUSY;
637 }
638
639 return 0;
640}
641EXPORT_SYMBOL(gpmc_prefetch_enable);
642
643/**
644 * gpmc_prefetch_reset - disables and stops the prefetch engine
645 */
646int gpmc_prefetch_reset(int cs)
647{
648 u32 config1;
649
650 /* check if the same module/cs is trying to reset */
651 config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
652 if (((config1 >> CS_NUM_SHIFT) & 0x7) != cs)
653 return -EINVAL;
654
655 /* Stop the PFPW engine */
656 gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x0);
657
658 /* Reset/disable the PFPW engine */
659 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, 0x0);
660
661 return 0;
662}
663EXPORT_SYMBOL(gpmc_prefetch_reset);
664
665static void __init gpmc_mem_init(void)
666{
667 int cs;
668 unsigned long boot_rom_space = 0;
669
670 /* never allocate the first page, to facilitate bug detection;
671 * even if we didn't boot from ROM.
672 */
673 boot_rom_space = BOOT_ROM_SPACE;
674 /* In apollon the CS0 is mapped as 0x0000 0000 */
675 if (machine_is_omap_apollon())
676 boot_rom_space = 0;
677 gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
678 gpmc_mem_root.end = GPMC_MEM_END;
679
680 /* Reserve all regions that has been set up by bootloader */
681 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
682 u32 base, size;
683
684 if (!gpmc_cs_mem_enabled(cs))
685 continue;
686 gpmc_cs_get_memconf(cs, &base, &size);
687 if (gpmc_cs_insert_mem(cs, base, size) < 0)
688 BUG();
689 }
690}
691
692static int __init gpmc_init(void)
693{
694 u32 l, irq;
695 int cs, ret = -EINVAL;
696 int gpmc_irq;
697 char *ck = NULL;
698
699 if (cpu_is_omap24xx()) {
700 ck = "core_l3_ck";
701 if (cpu_is_omap2420())
702 l = OMAP2420_GPMC_BASE;
703 else
704 l = OMAP34XX_GPMC_BASE;
705 gpmc_irq = INT_34XX_GPMC_IRQ;
706 } else if (cpu_is_omap34xx()) {
707 ck = "gpmc_fck";
708 l = OMAP34XX_GPMC_BASE;
709 gpmc_irq = INT_34XX_GPMC_IRQ;
710 } else if (cpu_is_omap44xx()) {
711 ck = "gpmc_ck";
712 l = OMAP44XX_GPMC_BASE;
713 gpmc_irq = OMAP44XX_IRQ_GPMC;
714 }
715
716 if (WARN_ON(!ck))
717 return ret;
718
719 gpmc_l3_clk = clk_get(NULL, ck);
720 if (IS_ERR(gpmc_l3_clk)) {
721 printk(KERN_ERR "Could not get GPMC clock %s\n", ck);
722 BUG();
723 }
724
725 gpmc_base = ioremap(l, SZ_4K);
726 if (!gpmc_base) {
727 clk_put(gpmc_l3_clk);
728 printk(KERN_ERR "Could not get GPMC register memory\n");
729 BUG();
730 }
731
732 clk_enable(gpmc_l3_clk);
733
734 l = gpmc_read_reg(GPMC_REVISION);
735 printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
736 /* Set smart idle mode and automatic L3 clock gating */
737 l = gpmc_read_reg(GPMC_SYSCONFIG);
738 l &= 0x03 << 3;
739 l |= (0x02 << 3) | (1 << 0);
740 gpmc_write_reg(GPMC_SYSCONFIG, l);
741 gpmc_mem_init();
742
743 /* initalize the irq_chained */
744 irq = OMAP_GPMC_IRQ_BASE;
745 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
746 irq_set_chip_and_handler(irq, &dummy_irq_chip,
747 handle_simple_irq);
748 set_irq_flags(irq, IRQF_VALID);
749 irq++;
750 }
751
752 ret = request_irq(gpmc_irq,
753 gpmc_handle_irq, IRQF_SHARED, "gpmc", gpmc_base);
754 if (ret)
755 pr_err("gpmc: irq-%d could not claim: err %d\n",
756 gpmc_irq, ret);
757 return ret;
758}
759postcore_initcall(gpmc_init);
760
761static irqreturn_t gpmc_handle_irq(int irq, void *dev)
762{
763 u8 cs;
764
765 /* check cs to invoke the irq */
766 cs = ((gpmc_read_reg(GPMC_PREFETCH_CONFIG1)) >> CS_NUM_SHIFT) & 0x7;
767 if (OMAP_GPMC_IRQ_BASE+cs <= OMAP_GPMC_IRQ_END)
768 generic_handle_irq(OMAP_GPMC_IRQ_BASE+cs);
769
770 return IRQ_HANDLED;
771}
772
773#ifdef CONFIG_ARCH_OMAP3
774static struct omap3_gpmc_regs gpmc_context;
775
776void omap3_gpmc_save_context(void)
777{
778 int i;
779
780 gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
781 gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
782 gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
783 gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
784 gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
785 gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
786 gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
787 for (i = 0; i < GPMC_CS_NUM; i++) {
788 gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
789 if (gpmc_context.cs_context[i].is_valid) {
790 gpmc_context.cs_context[i].config1 =
791 gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
792 gpmc_context.cs_context[i].config2 =
793 gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
794 gpmc_context.cs_context[i].config3 =
795 gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
796 gpmc_context.cs_context[i].config4 =
797 gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
798 gpmc_context.cs_context[i].config5 =
799 gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
800 gpmc_context.cs_context[i].config6 =
801 gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
802 gpmc_context.cs_context[i].config7 =
803 gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
804 }
805 }
806}
807
808void omap3_gpmc_restore_context(void)
809{
810 int i;
811
812 gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
813 gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
814 gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
815 gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
816 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
817 gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
818 gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
819 for (i = 0; i < GPMC_CS_NUM; i++) {
820 if (gpmc_context.cs_context[i].is_valid) {
821 gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
822 gpmc_context.cs_context[i].config1);
823 gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
824 gpmc_context.cs_context[i].config2);
825 gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
826 gpmc_context.cs_context[i].config3);
827 gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
828 gpmc_context.cs_context[i].config4);
829 gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
830 gpmc_context.cs_context[i].config5);
831 gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
832 gpmc_context.cs_context[i].config6);
833 gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
834 gpmc_context.cs_context[i].config7);
835 }
836 }
837}
838#endif /* CONFIG_ARCH_OMAP3 */
839
840/**
841 * gpmc_enable_hwecc - enable hardware ecc functionality
842 * @cs: chip select number
843 * @mode: read/write mode
844 * @dev_width: device bus width(1 for x16, 0 for x8)
845 * @ecc_size: bytes for which ECC will be generated
846 */
847int gpmc_enable_hwecc(int cs, int mode, int dev_width, int ecc_size)
848{
849 unsigned int val;
850
851 /* check if ecc module is in used */
852 if (gpmc_ecc_used != -EINVAL)
853 return -EINVAL;
854
855 gpmc_ecc_used = cs;
856
857 /* clear ecc and enable bits */
858 val = ((0x00000001<<8) | 0x00000001);
859 gpmc_write_reg(GPMC_ECC_CONTROL, val);
860
861 /* program ecc and result sizes */
862 val = ((((ecc_size >> 1) - 1) << 22) | (0x0000000F));
863 gpmc_write_reg(GPMC_ECC_SIZE_CONFIG, val);
864
865 switch (mode) {
866 case GPMC_ECC_READ:
867 gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
868 break;
869 case GPMC_ECC_READSYN:
870 gpmc_write_reg(GPMC_ECC_CONTROL, 0x100);
871 break;
872 case GPMC_ECC_WRITE:
873 gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
874 break;
875 default:
876 printk(KERN_INFO "Error: Unrecognized Mode[%d]!\n", mode);
877 break;
878 }
879
880 /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
881 val = (dev_width << 7) | (cs << 1) | (0x1);
882 gpmc_write_reg(GPMC_ECC_CONFIG, val);
883 return 0;
884}
885
886/**
887 * gpmc_calculate_ecc - generate non-inverted ecc bytes
888 * @cs: chip select number
889 * @dat: data pointer over which ecc is computed
890 * @ecc_code: ecc code buffer
891 *
892 * Using non-inverted ECC is considered ugly since writing a blank
893 * page (padding) will clear the ECC bytes. This is not a problem as long
894 * no one is trying to write data on the seemingly unused page. Reading
895 * an erased page will produce an ECC mismatch between generated and read
896 * ECC bytes that has to be dealt with separately.
897 */
898int gpmc_calculate_ecc(int cs, const u_char *dat, u_char *ecc_code)
899{
900 unsigned int val = 0x0;
901
902 if (gpmc_ecc_used != cs)
903 return -EINVAL;
904
905 /* read ecc result */
906 val = gpmc_read_reg(GPMC_ECC1_RESULT);
907 *ecc_code++ = val; /* P128e, ..., P1e */
908 *ecc_code++ = val >> 16; /* P128o, ..., P1o */
909 /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
910 *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0);
911
912 gpmc_ecc_used = -EINVAL;
913 return 0;
914}